Help with QoS basic configuration.

martin.germano · ‎01-21-2014

Hi all, i want to configure qos in a cisco lan with non cisco phone. I read a lot of documentation and some basic videos. I don't want to configure it very granular, so, the most basic commands that i found:

conf t

int fa0/5

switchport voice vlan 111

mls qos trust cos

auto qos voip trust

How i'm be realy sure that QoS is working on mi lan?

And how about the interface trunk configuration?

Any suggestion?

Here are the verification:

In the show running-configuration :

mls qos map cos-dscp 0 8 16 24 32 46 48 56

mls qos srr-queue input bandwidth 70 30

mls qos srr-queue input threshold 1 80 90

mls qos srr-queue input priority-queue 2 bandwidth 30

mls qos srr-queue input cos-map queue 1 threshold 2 3

mls qos srr-queue input cos-map queue 1 threshold 3 6 7

mls qos srr-queue input cos-map queue 2 threshold 1 4

mls qos srr-queue input dscp-map queue 1 threshold 2 24

mls qos srr-queue input dscp-map queue 1 threshold 3 48 49 50 51 52 53 54 55

mls qos srr-queue input dscp-map queue 1 threshold 3 56 57 58 59 60 61 62 63

mls qos srr-queue input dscp-map queue 2 threshold 3 32 33 40 41 42 43 44 45

mls qos srr-queue input dscp-map queue 2 threshold 3 46 47

mls qos srr-queue output cos-map queue 1 threshold 3 4 5

mls qos srr-queue output cos-map queue 2 threshold 1 2

mls qos srr-queue output cos-map queue 2 threshold 2 3

mls qos srr-queue output cos-map queue 2 threshold 3 6 7

mls qos srr-queue output cos-map queue 3 threshold 3 0

mls qos srr-queue output cos-map queue 4 threshold 3 1

mls qos srr-queue output dscp-map queue 1 threshold 3 32 33 40 41 42 43 44 45

mls qos srr-queue output dscp-map queue 1 threshold 3 46 47

mls qos srr-queue output dscp-map queue 2 threshold 1 16 17 18 19 20 21 22 23

mls qos srr-queue output dscp-map queue 2 threshold 1 26 27 28 29 30 31 34 35

mls qos srr-queue output dscp-map queue 2 threshold 1 36 37 38 39

mls qos srr-queue output dscp-map queue 2 threshold 2 24

mls qos srr-queue output dscp-map queue 2 threshold 3 48 49 50 51 52 53 54 55

mls qos srr-queue output dscp-map queue 2 threshold 3 56 57 58 59 60 61 62 63

mls qos srr-queue output dscp-map queue 3 threshold 3 0 1 2 3 4 5 6 7

mls qos srr-queue output dscp-map queue 4 threshold 1 8 9 11 13 15

mls qos srr-queue output dscp-map queue 4 threshold 2 10 12 14

mls qos queue-set output 1 threshold 1 100 100 50 200

mls qos queue-set output 1 threshold 2 125 125 100 400

mls qos queue-set output 1 threshold 3 100 100 100 400

mls qos queue-set output 1 threshold 4 60 150 50 200

mls qos queue-set output 1 buffers 15 25 40 20

mls qos

In the interface configuration:

interface FastEthernet0/5

switchport access vlan 111

switchport mode access

switchport voice vlan 111

srr-queue bandwidth share 1 30 35 5

priority-queue out

mls qos trust cos

auto qos trust

spanning-tree portfast

In trunk port:

interface GigabitEthernet0/1

switchport mode trunk

sh mls qos int f0/5

FastEthernet0/5

trust state: trust cos

trust mode: trust cos

trust enabled flag: ena

COS override: dis

default COS: 0

DSCP Mutation Map: Default DSCP Mutation Map

Trust device: none

qos mode: port-based

Thanks a lot !

Martín.

Nadeem Ahmed · ‎01-21-2014

Hello Martin,

Just go through this once, this might help you

http://www.dslreports.com/faq/13324

Br,
Nadeem

Please rate all useful post.

Br, Nadeem Please rate all useful post.

martin.germano · ‎01-22-2014

Hi Nadeem, this is a very complete article. But i still wondering how i can be sure that QoS really works in my entire lan. I tried debug commands but didn't work.

Thanks.

Joseph Martini · ‎01-22-2014

One way to test your QoS configuration is with network traffic tools such as iperf (http://sourceforge.net/projects/iperf/). You can send traffic across the network and place a phone call and see how the audio sounds. Alternatively you can use IPSLA (http://www.cisco.com/en/US/products/ps6602/products_ios_protocol_group_home.html) to monitor your network traffic.

martin.germano · ‎01-23-2014

Hi, thanks for reply. I investigate a little more.

When i want verify that QoS really work in the lan, first of all:

- The marking (in my case verify traffic VoIP at 64)

- Queue, that put first in the queue voice traffic, dscp 64

To try, i make a call connecting an IP phone (in fa0/6) and call to analog phone. Wait for 2 minutes and see what changes in this command:

Switch#sh mls qos int f0/6 st

FastEthernet0/6 (All statistics are in packets)

dscp: incoming

-------------------------------

0 - 4 : 4465744658 0 0 0 0

5 - 9 : 0 0 0 0 0

10 - 14 : 0 0 0 0 0

15 - 19 : 0 0 0 0 0

20 - 24 : 0 0 0 0 0

25 - 29 : 0 1196 0 0 0

30 - 34 : 0 0 0 0 0

35 - 39 : 0 0 0 0 0

40 - 44 : 0 0 0 0 0

45 - 49 : 0 41769 62163 0 91 98 0

50 - 54 : 0 0 0 0 0

55 - 59 : 0 0 0 0 0

60 - 64 : 0 0 0 0

dscp: outgoing

-------------------------------

0 - 4 : 251670 272323 0 0 0 0

5 - 9 : 0 0 0 0 0

10 - 14 : 0 0 0 0 0

15 - 19 : 0 0 0 0 0

20 - 24 : 0 0 0 0 0

25 - 29 : 0 0 0 0 0

30 - 34 : 0 0 0 0 0

35 - 39 : 0 0 0 0 0

40 - 44 : 0 0 0 0 0

45 - 49 : 0 3393 0 0 0

50 - 54 : 0 0 0 0 0

55 - 59 : 0 0 0 0 0

60 - 64 : 0 0 0 0

cos: incoming

-------------------------------

0 - 4 : 89094 109541 0 0 0 0

5 - 7 : 0 0 0

cos: outgoing

-------------------------------

0 - 4 : 295699 316387 0 0 0 0

5 - 7 : 3393 0 0

output queues enqueued:

queue: threshold1 threshold2 threshold3

-----------------------------------------------

queue 0: 2 0 0

queue 1: 209108 1534 194272

queue 2: 0 0 56565

queue 3: 0 0 33762

output queues dropped:

queue: threshold1 threshold2 threshold3

-----------------------------------------------

queue 0: 0 0 0

queue 1: 57 0 0

queue 2: 0 0 0

queue 3: 0 0 0

Policer: Inprofile: 0 OutofProfile: 0

The underlined numbers is the variations in aprox. 2 minutes in the call. That mean that the traffic was marked as VoIP traffic, but i´m not sure that the traffic is queued right.

I´m wrong?

Thanks for the help

PS:Later monitoring: with iperf or Cacti using IP SLA.